The French or "Flake" spawn comes in light masses of loose, dry litter. It is obtained in the following way: A bed is made up as if for mushrooms in the ordinary way, and spawned with "virgin" spawn, and when the bed is thoroughly impregnated with spawn, it is broken up and set aside to dry. This spawn is usually sold in small boxes, containing from two to five pounds, but it also can be obtained in bulk when it is purchased by weight. The French or "flake" spawn is much more expensive than the English or "brick" spawn. It is claimed by some very successful growers, who have tried both, that the brick spawn produces heavier and fleshier mushrooms than the French "flake." "MILL TRACK" SPAWN. "Mill track" spawn was formerly considered the best in England, but since horse power has given place to steam power in the mills there is now no further supply of mill track, and it is practically superseded by the "brick" spawn. The real "mill track" is the natural spawn that has spread through the thoroughly amalgamated horse droppings in mill tracks, or the sweepings from mill tracks. SPAWN PRODUCED IN A MANURE HEAP. During the past year I have made some experiments in the pine and oak woods of Hynesboro' Park, Maryland, with relation to spawn culture, an account of which may prove of interest to students in this line of investigation. Several loads of stable manure and oak-leaf bedding were well mixed and formed into a mound about three feet in height, having a diameter of six feet, and tapering to about four inches in depth at the outer edge. The mass was quite moist and slightly tamped to give it general consistency. It was exposed to the open air, without protection, during the months of September, October, and November. In the meantime, frequent rains occurred. On examination it was found that the rains did not penetrate to a depth of more than four inches. On opening up the centre of the mound, it was observed that the portion thus exposed consisted of highly decomposed leaves, and presented a white mass of matted, "burned" mycelium. It was evident that the temperature at that point had risen considerably above 100 Fahr. The mycelium was, doubtless, produced in abundance before the temperature reached 100 Fahr. and became scorched as the temperature increased. On examining the outer edges, where the depth was only twelve inches, I found an abundance of mycelium which did not show any appearance of having been scorched by undue temperature. Since no mycelium had been added to the mound, it is evident that the spores which produced it must have been present, although unobserved, and awaiting only the proper conditions for development, _i. e._, for budding and the production of mycelium. At the end of the third month, groups of the common meadow mushroom, Agaricus campestris, together with some fine examples of Tricholoma terreum, an edible mushroom, common to these woods, appeared on the edges of the mound. APPENDIX A.